Tutanota

ProtonMail

ProtonMail is the world's largest secure email service, designed to keep your private communications truly private through end-to-end encryption and zero-access architecture. Based in Switzerland, it ensures your sensitive data remains shielded from third-party tracking, advertising algorithms, and unauthorized surveillance. With apps available across web, desktop, and mobile devices, it seamlessly integrates advanced cryptographic security into your daily workflow without sacrificing ease of use. Users can easily send encrypted emails to anyone, manage custom domains, and organize their inbox with modern productivity features.

Proton Mail

Proton Mail is a secure, privacy-focused email service founded by CERN scientists and protected by strict Swiss privacy laws. It utilizes end-to-end encryption and zero-access encryption to ensure that even the provider cannot read user messages. The platform offers a seamless experience across web and mobile devices, featuring modern interfaces, custom domain support, and integrated calendar and drive services. Designed for individuals and organizations seeking ultimate data confidentiality, it removes ads and trackers from standard email workflows.

Runbox

Runbox is an independent email hosting provider based in Norway that places a heavy emphasis on privacy, security, and environmental sustainability. Operating since 2000, it leverages strict Norwegian privacy laws and GDPR compliance to ensure user data remains confidential and protected from foreign surveillance. The service is fully powered by 100% renewable energy and operates on a carbon-negative footprint. Runbox offers an ad-free experience, custom domain support, and robust spam protection while maintaining full compatibility with standard email clients via IMAP, POP3, and SMTP.